Visually, all MaskedInput controls are equal - the Style that is applied to them is actually targeting RadMaskedInputBase which is the base class for the 4 masked input controls. So this shouldn't be a showstopper for you. In order to restrict only digits input int he TextInput is to use #-symbols in the Mask but this way you will set the exact max number of digits user can type.
As for the FormatString, if you are able to use a particular custom FormatString in TextBox whose Value is bound to double (and you set this custom StringFormat on the binding) this should also work in no-masked NumericInput. If it does not work in the MaskedInput but it works in TextBox we can log this as a bug in our system and consider fixing it in future releases.
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